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Search: Posts Made By: FCeng84
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Forum: Rumours & News
7th Dec 2018, 21:47
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

With correct AOA supplied to the MCAS function,...

With correct AOA supplied to the MCAS function, it will begin automatic nose down stabilizer insertion when AOA first exceeds the MCAS activation AOA threshold. The amount of stabilizer motion that...
Forum: Rumours & News
7th Dec 2018, 17:48
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

' Turbine70 - the "intermittent and...

'

Turbine70 - the "intermittent and unadvertised control input" that the JT610 crew experienced was a result of the AOA sensor failure combined with MCAS. I agree with your questioning how that...
Forum: Rumours & News
6th Dec 2018, 16:03
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

To address your question I think it is important...

To address your question I think it is important to be very clear with regard to your phrase "non-linearity in control response". The FAR in question speaks to the progression of column pull force...
Forum: Rumours & News
6th Dec 2018, 05:40
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

Volume - MCAS was not introduced to make up for...

Volume - MCAS was not introduced to make up for deficient elevator nose down control authority. MCAS is there to improve handling characteristics as proscribed by the FARs at elevated AOA. The pilot...
Forum: Rumours & News
6th Dec 2018, 05:08
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

MickG - careful now. This is not at all a matter...

MickG - careful now. This is not at all a matter of HAL saying "I'm afraid I can't allow that, Dave." What is happening here is that MCAS has inserted a nose down stabilizer motion increment in...
Forum: Rumours & News
5th Dec 2018, 13:37
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

MCAS descriptive wording may not be written in...

MCAS descriptive wording may not be written in the clearest manner. That aside, I know the design intent and implementation with enough detail to confidently say that MCAS authority is limited to 2.5...
Forum: Rumours & News
4th Dec 2018, 21:19
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

Loose Rivets - please review last couple of pages...

Loose Rivets - please review last couple of pages of comments and explain your latest. How does fuel flow have anything to do with this event???
Forum: Rumours & News
4th Dec 2018, 16:32
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

I sure hope neither I nor anyone I care deeply...

I sure hope neither I nor anyone I care deeply about ever rides in the back of an airplane being piloted by crew who don’t recall the stabilizer cutout seitches, where they are, or when to use them
Forum: Rumours & News
4th Dec 2018, 15:57
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

gums - I mostly agree. The one point I would add...

gums - I mostly agree. The one point I would add is that the gradual net nose down stabilizer motion prior to the last minute is likely that required to maintain pitch trim as speed increases. They...
Forum: Rumours & News
4th Dec 2018, 10:39
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

With AOA reading erroneously high, each time that...

With AOA reading erroneously high, each time that the crew trimmed nose up the criteria for MCAS to put in another nose down increment were satisfied. For several minutes the pattern of MCAS puts in...
Forum: Rumours & News
4th Dec 2018, 10:12
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

The amount of nose down stabilizer MCAS puts in...

The amount of nose down stabilizer MCAS puts in is a function of how far beyond the activation AOA MCAS senses that the airplane has gone. You have it correct that MCAS leaves that stabilizer...
Forum: Rumours & News
4th Dec 2018, 09:53
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

Bernd - As for your first two points above, you...

Bernd - As for your first two points above, you have it right. MCAS does not know where “trim” is, but it does two things related to trim. First, it will undo what it does in response to high AOA...
Forum: Rumours & News
4th Dec 2018, 07:34
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

MCAS will not command more than one increment of...

MCAS will not command more than one increment of nose down trim without either having taken out the first one (via the same amount of nose up trim) or having sensed manual pilot electric pitch trim.
Forum: Rumours & News
4th Dec 2018, 06:56
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

MCAS functionality

It is surprising to me that the details of the MCAS functionality have not come to full focus here within PPRUNE yet. MCAS inserts airplane nose down stabilizer as a function of Mach number and how...
Forum: Rumours & News
2nd Dec 2018, 03:56
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

737 Max does not have elevator authority issue

Some on this thread have suggested that MCAS May have been added to compensate for an elevator authority shortfall. That is not the case. This function was added to address a pitching moment vs AOA...
Forum: Rumours & News
24th Nov 2018, 07:00
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

A couple of AOA and MCAS details to consider: ...

A couple of AOA and MCAS details to consider:

1. AOA vanes measure the angle of the airflow at the location of the sensor. The fuselage distorts the flow such that the vane angle does not match...
Forum: Rumours & News
22nd Nov 2018, 23:15
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

AGBagb - Activation of the both stab cutout...

AGBagb - Activation of the both stab cutout switches should disable all electric control of the stabilizer. One can, however, imagine a failure that involves one or more electrical shorts that...
Forum: Rumours & News
22nd Nov 2018, 20:43
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

737 MCAS clarifications: 1. MCAS does not...

737 MCAS clarifications:

1. MCAS does not override pilot column or stabilizer trim inputs. Column controls the elevator regardless of MCAS commands. Pilot's pitch trim electric switches override...
Forum: Rumours & News
14th Nov 2018, 02:47
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

Per https://twitter.com/jonostrower the 737 MAX...

Per https://twitter.com/jonostrower the 737 MAX MCAS system runs the stabilizer at 0.27 deg/sec regardless of speed/mach. The amount of nose down stab motion provided by MCAS is listed as "up to 2.5...
Forum: Rumours & News
13th Nov 2018, 22:57
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

A couple of thoughts on cruise deck angle and...

A couple of thoughts on cruise deck angle and maximum performance (i.e., L/D):

1. At a given airplane configuration (read flap/gear position and payload/fuel distribution) the deck angle that...
Forum: Rumours & News
13th Nov 2018, 19:47
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

The shape of a commercial airplane wing (twist,...

The shape of a commercial airplane wing (twist, sweep, variation in cord and camber along the span, etc.) is very complex. As such it would be quite a trick to define a true "zero AOA" reference....
Forum: Rumours & News
12th Nov 2018, 18:13
Replies: 2,099
Views: 1,471,910
Posted By FCeng84

On the topic of stabilizer jack-screw speed I...

On the topic of stabilizer jack-screw speed I believe the video clip attached a few entries back is not showing the fastest available speed. 777 and 787 have stabilizer ranges of approximately 15...
Showing results 1 to 22 of 22


 
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